Journal
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
Volume 18, Issue 4, Pages 989-998Publisher
SPRINGER
DOI: 10.1007/s11998-021-00476-y
Keywords
Waterborne polyurethane; CO2-triggered hydrophilic; hydrophobic transformation; Water resistance; Mechanical properties
Funding
- National Natural Science Foundation of China [51673056]
- University Synergy Innovation Program of Anhui Province [GXXT-2019-001]
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In this study, a CO2-triggered hydrophobic/hydrophilic switchable waterborne polyurethane-acrylate (WPUA) containing methyl methacrylate (MMA) units was designed and characterized for its excellent water resistance and mechanical properties. The WPUA with 10 wt% MMA showed low water uptake, high tensile strength, and modulus, indicating improved properties compared to traditional WPU. This study demonstrated that CO2-triggered WPUA dispersed stably as latex particles in water and exhibited outstanding performance after film formation.
Traditional waterborne polyurethane (WPU) has poor water resistance because of the incorporation of permanent hydrophilic groups, such as carboxyl group or ammonium salt, into polymer chains. Therefore, developing WPU with excellent water resistance and mechanical properties is highly desirable for industrial applications. In this study, CO2-triggered hydrophobic/hydrophilic switchable waterborne polyurethane-acrylate (WPUA) containing methyl methacrylate (MMA) units were designed and synthesized. The molecular structure, hydrophobic/hydrophilic switchable behavior, water resistance, and mechanical properties were systematically investigated and characterized. The WPUA with 10 wt% MMA exhibited a low water uptake (2.15 wt%) and linear swelling ratio (0.17 L%), as well as a high tensile strength (16.7 MPa) and modulus (85.9 MPa), which were much higher than those of the pristine WPU. This study indicated that the CO2-triggered WPUA dispersed stably as latex particles in water and possessed excellent water resistance and mechanical properties after the film formation.
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